/branches/1.x/Ionian/Examples/Framework/ParticleAcceleration/MainForm.cs

#region MIT.

// 

// Examples.

// Copyright (C) 2008 Michael Winsor

// 

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

// 

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

// 

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

// 

// Created: Thursday, October 02, 2008 10:46:02 PM

// 

#endregion



using System;

using System.Collections.Generic;

using System.ComponentModel;

using Drawing = System.Drawing;

using System.Text;

using System.Windows.Forms;

using Dialogs;

using GorgonLibrary;

using GorgonLibrary.Framework;

using GorgonLibrary.Graphics;

using GorgonLibrary.Graphics.Utilities;

using GorgonLibrary.InputDevices;



namespace GorgonLibrary.Example

{

	/// <summary>

	/// Main application form.

	/// </summary>

	public partial class MainForm 

		: GorgonApplicationWindow

	{

		#region Variables.

		private Random _rnd = new Random();										// Random number generator.

		private List<ParticleEmitter> _emitters = null;							// List of particle emitters.

		private RenderImage _particleImage = null;								// Particle image.

		private RenderImage _screen = null;										// Primary target.

		private Sprite _particleSprite = null;									// Particle sprite.

		private bool _clearScreen = false;										// Flag to indicate that we should clear each frame.

		private PreciseTimer _timer = new PreciseTimer();						// Timer object.

		private PreciseTimer _splatTimer = new PreciseTimer();					// Particle splat timer.

		private TextSprite _text = null;										// Help text.

		private bool _inverted = false;											// Flag to invert the screen.

		private bool _showHelp = true;											// Flag to show help text.

		#endregion



		#region Methods.

		/// <summary>

		/// Function to perform logic updates.

		/// </summary>

		/// <param name="e">Frame event parameters.</param>

		protected override void OnLogicUpdate(FrameEventArgs e)

		{

			base.OnLogicUpdate(e);



			int i = 0;



			if (_inverted)

			{

				_text.Color = Drawing.Color.White;

				_particleSprite.BlendingMode = BlendingModes.Additive;

				_screen.BackgroundColor = Drawing.Color.Black;

			}

			else

			{

				_text.Color = Drawing.Color.Black;

				_particleSprite.BlendingMode = BlendingModes.Modulated;

				_screen.BackgroundColor = Drawing.Color.White;

			}



			while (i < _emitters.Count)

			{

				if (_emitters[i].Age < _emitters[i].ParticleLifetimeRange.End)

				{

					_emitters[i].Update(e.FrameDeltaTime);

					i++;

				}

				else

					_emitters.Remove(_emitters[i]);

			}

		}



		/// <summary>

		/// Function to perform rendering updates.

		/// </summary>

		/// <param name="e">Frame event parameters.</param>

		protected override void OnFrameUpdate(FrameEventArgs e)

		{

			base.OnFrameUpdate(e);



			int i = 0;



			Gorgon.CurrentRenderTarget = _screen;



			if (_clearScreen)

				_screen.Clear();

			else

			{

				if (_timer.Milliseconds > 12.5)

				{

					if (!_inverted)

					{

						_screen.BlendingMode = BlendingModes.Additive;

						_screen.FilledRectangle(0, 0, _screen.Width, _screen.Height, Drawing.Color.FromArgb(1, _rnd.Next(0, 255), _rnd.Next(0, 255), _rnd.Next(0, 255)));

						_screen.BlendingMode = BlendingModes.None;

					}

					else

					{

						_screen.BlendingMode = BlendingModes.Modulated;

						_screen.FilledRectangle(0, 0, _screen.Width, _screen.Height, Drawing.Color.FromArgb(1, _rnd.Next(0, 255), _rnd.Next(0, 255), _rnd.Next(0, 255)));

						_screen.BlendingMode = BlendingModes.None;

					}

					_timer.Reset();

				}

			}



			for (i = 0; i < _emitters.Count; i++)

				_emitters[i].Draw();



			Gorgon.CurrentRenderTarget = null;			

			_screen.Blit();

			if (_showHelp)

			{

				_text.Text = "H - Show/hide this help text.\nI - Invert and use additive blending.\nLeft mouse button - Splat some particles.\nRight mouse button - Splat multicolored particles.\nMiddle mouse button - Toggle clear each frame.\nCTRL + F - Show frame statistics.\nESC - Exit.\n\nParticle emitter count: " + _emitters.Count.ToString();

				_text.Draw();

			}

		}



		/// <summary>

		/// Function called when the video device is set to a lost state.

		/// </summary>

		protected override void OnDeviceLost()

		{

			base.OnDeviceLost();

		}



		/// <summary>

		/// Function called when a keyboard key is pushed down.

		/// </summary>

		/// <param name="e">Keyboard event parameters.</param>

		protected override void OnKeyboardKeyDown(KeyboardInputEventArgs e)

		{

			base.OnKeyboardKeyDown(e);



			if (e.Key == KeyboardKeys.I)

				_inverted = !_inverted;

			if (e.Key == KeyboardKeys.H)

				_showHelp = !_showHelp;

		}



		/// <summary>

		/// Function called when the video device has recovered from a lost state.

		/// </summary>

		protected override void OnDeviceReset()

		{

			base.OnDeviceReset();

			_screen.Width = Gorgon.Screen.Width;

			_screen.Height = Gorgon.Screen.Height;

			_screen.Clear();

		}



		/// <summary>

		/// Function to create a particle.

		/// </summary>

		private void CreateParticle()

		{

			Drawing.Color particleColor;



			_particleImage.Clear(Drawing.Color.Transparent);

			_particleImage.BeginDrawing();

			for (int x = 64; x > 0; x--)

			{

				particleColor = Drawing.Color.FromArgb(255 - ((x * 4) - 1), 255, 255, 255);

				_particleImage.FilledCircle(32.0f, 32.0f, x / 2, particleColor);

			}

			_particleImage.EndDrawing();

		}



		/// <summary>

		/// Function to create a particle emitter.

		/// </summary>

		/// <param name="position">The position of the emitter.</param>

		/// <returns>A new emitter.</returns>

		private ParticleEmitter CreateEmitter(Vector2D position)

		{

			ParticleEmitter emitter = null;



			emitter = new ParticleEmitter("Emitter" + _emitters.Count.ToString(), _particleSprite, position);

			emitter.ColorRange = new Range<Drawing.Color>(Drawing.Color.Black, Drawing.Color.FromArgb(0, Drawing.Color.Black));

			emitter.ContinuousParticles = false;

			emitter.EmitterLifetime = 1.5f;

			emitter.ParticleLifetimeRange = new Range<float>(0.0f, (float)(_rnd.NextDouble() * 10.0) + 5.0f);

			emitter.ParticleSizeRange = new Range<float>((float)(_rnd.NextDouble() * 1.5) + 0.25f, 0.0f);

			emitter.ParticleSpeedRange = new Range<float>(0.0f, (float)(_rnd.NextDouble() * 10.0) + 4.0f);

			emitter.TangentialAccelerationRange = new Range<float>(0.0f, 0.0f);

			emitter.RadialAccelerationRange = new Range<float>(0.0f, (float)(_rnd.NextDouble() * 10.0) + 4.0f);

			emitter.ParticleRotationRange = new Range<float>(-10.0f, 10.0f);

			emitter.Spread = (float)(_rnd.NextDouble() * 360.0);

			emitter.EmitterScale = 1.0f;

			_splatTimer.Reset();



			_emitters.Add(emitter);

			return emitter;

		}



		/// <summary>

		/// Function called when the mouse is moved.

		/// </summary>

		/// <param name="e">Mouse event parameters.</param>

		protected override void OnMouseMovement(MouseInputEventArgs e)

		{

			base.OnMouseMovement(e);



			ParticleEmitter emitter = null;

			Drawing.Color startColor;

			Drawing.Color endColor;

			int alpha = 255;



			if (_clearScreen)

				alpha = _rnd.Next(64, 192);



			if (_splatTimer.Milliseconds >= 10)

			{

				switch (e.Buttons)

				{

					case GorgonLibrary.InputDevices.MouseButtons.Button1:

						startColor = Drawing.Color.FromArgb(alpha, _rnd.Next(0, 255), _rnd.Next(0, 255), _rnd.Next(0, 255));

						endColor = Drawing.Color.FromArgb(0, startColor);



						emitter = CreateEmitter(e.Position);

						emitter.ColorRange = new Range<System.Drawing.Color>(startColor, endColor);

						break;



					case GorgonLibrary.InputDevices.MouseButtons.Button2:

						startColor = Drawing.Color.FromArgb(alpha, Drawing.Color.Black);

						endColor = Drawing.Color.FromArgb(0, Drawing.Color.White);



						emitter = CreateEmitter(e.Position);

						emitter.ColorRange = new Range<System.Drawing.Color>(startColor, endColor);

						break;

				}

				_splatTimer.Reset();

			}

		}



		/// <summary>

		/// Function called when a mouse button is pushed down.

		/// </summary>

		/// <param name="e">Mouse event parameters.</param>

		protected override void OnMouseButtonDown(MouseInputEventArgs e)

		{

			base.OnMouseButtonDown(e);



			ParticleEmitter emitter = null;

			Drawing.Color startColor;

			Drawing.Color endColor;

			int alpha = 255;



			if (e.Buttons == GorgonLibrary.InputDevices.MouseButtons.Button3)

				_clearScreen = !_clearScreen;

			else

			{

				if (_clearScreen)

					alpha = _rnd.Next(64, 192);



				if (e.Buttons == GorgonLibrary.InputDevices.MouseButtons.Button1)

				{

					startColor = Drawing.Color.FromArgb(alpha, _rnd.Next(0, 255), _rnd.Next(0, 255), _rnd.Next(0, 255));

					endColor = Drawing.Color.FromArgb(0, startColor);

				}

				else

				{

					startColor = Drawing.Color.FromArgb(alpha, Drawing.Color.Black);

					endColor = Drawing.Color.FromArgb(0, Drawing.Color.White);

				}



				emitter = CreateEmitter(e.Position);

				emitter.ColorRange = new Range<System.Drawing.Color>(startColor, endColor);

			}			

		}



		/// <summary>

		/// Function to provide initialization for our example.

		/// </summary>

		protected override void Initialize()

		{

			try

			{

				_text = new TextSprite("Help Text", string.Empty, FrameworkFont, Drawing.Color.Black);

				

				_particleImage = new RenderImage("ParticleImage", 64, 64, ImageBufferFormats.BufferRGB888A8);

				_screen = new RenderImage("Screen", Gorgon.Screen.Width, Gorgon.Screen.Height, ImageBufferFormats.BufferRGB888X8);				



				CreateParticle();



				_particleSprite = new Sprite("ParticleSprite", _particleImage);

				_particleSprite.Axis = new Vector2D(32, 32);



				CreateEmitter(new Vector2D(Gorgon.Screen.Width / 2.0f, Gorgon.Screen.Height / 2.0f));

				_screen.Clear();

			}

			catch (Exception ex)

			{

				UI.ErrorBox(this, "Unable to initialize the application.", ex);

			}

		}

		#endregion



		#region Constructor.

		/// <summary>

		/// Constructor.

		/// </summary>

		public MainForm()

			: base(@".\ParticleAcceleration.xml")

		{

			InitializeComponent();

			_emitters = new List<ParticleEmitter>();

		}

		#endregion

	}

}